Silver powder composed of three-dimensional particle crystals and two-dimensional flaky crystals and preparation method of silver powder
A technology of flaky crystals and silver powder, which is applied in the direction of cable/conductor manufacturing, semiconductor devices, metal/alloy conductors, etc., can solve the problems of high process requirements, uniform degree difference, and affecting the performance of silver paste, and achieve high strength and conductivity sex high effect
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Embodiment 1
[0056] Dissolve 685g of silver nitrate in 8654g of distilled water, add 84g of potassium phosphate after dissolving, then add 37g of PVPk30, stir evenly to obtain a silver ion complex solution, and then pour the prepared solution into a double-layer glass beaker. In the interlayer of the beaker, water at 35°C was passed through and kept warm.
[0057] Under the conditions of stirring at 2000 r / min and 1 L / min of argon gas, a cyclohexane solution of glucose with a mass fraction of 25% was used as the reducing solution, and the reducing solution with 4 times the equivalent content of silver ions was used at 1 equivalent / min. Add to the above solution at a rapid rate, keeping the temperature change during the process less than 5°C.
[0058] After the addition is completed, the mixture is stirred for 10 min, and then 20 g of an ethanol solution containing 30% oleic acid is added for surface coating to obtain a solution containing silver particles.
[0059] The above slurry was wa...
Embodiment 2
[0062] Dissolve 352g of silver nitrate in 3514g of distilled water, add 152g of sodium phosphate after dissolving, then add 23g of gelatin, stir evenly to obtain a silver ion complex solution, and then pour the prepared solution into a double-layer glass beaker. Water at 40°C was poured into the interlayer of the beaker for heat preservation.
[0063] Under the condition of stirring at 3000r / min and passing argon gas at 1.3L / min, a cyclohexane solution of acetaldehyde with a mass fraction of 10% containing ethyl acetate was used as the reducing solution, and 1.7g of ethyl acetate and 4 times of The reducing solution with an equivalent silver ion content was added to the above solution at a rate of 1 equivalent / min, and the temperature change during the process was kept less than 5°C.
[0064] After the addition is completed, the mixture is stirred for 10 min, and then 10 g of an ethanol solution containing 25% oleic acid is added for surface coating to obtain a solution contai...
Embodiment 3
[0070] On the basis of Example 1 and Example 2 above, this example further tests the effect of silver ion concentration on the reaction and silver powder. The results show that the particle size distribution of silver powder can be adjusted by adjusting the concentration of silver ions. Generally, the concentration of silver ions needs to be controlled at 0.1-10 mol / L, and the preferred concentration is 0.1-5 mol / L or 0.5-2 mol / L. , and other conditions can be prepared to obtain a mixed silver powder with a size of 0.3-1.5 μm in three-dimensional granular crystals, and a size of less than 10 μm in length, 5-6 μm in width, and 200-500 nm in thickness of two-dimensional flake crystals.
[0071] This example further tests different reducing agents. The results show that the reducing agent can be a solution of a substance containing an aldehyde group or a hydroxyl group, such as a solution of glucose, formaldehyde, acetaldehyde, ascorbic acid, ethylene glycol or glycerol in cycloh...
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Abstract
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